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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7055281d5eddafbf36b14a6ba24d09b774ef9ffee58b9cfc7801d70d5f8298' 
  AND token = 'zHA0AXTo58nLOkZ5ntn1g+3zCuUFI66Fi5imsPLIiPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}